منابع مشابه
The CKM Phase in Heterotic Orbifold Models
We consider properties of the CKM phase in the heterotic orbifold models. We find that at the renormalizable level the CKM phase vanishes identically for the prime orbifolds, whereas it can be non-zero for some non-prime orbifolds. In particular, we study in detail the Z6-I orbifold which allows for a non-trivial CKM phase and analyze the modular properties of the corresponding Jarlskog invaria...
متن کاملThe KM phase in semi-realistic heterotic orbifold models
In string-inspired semi-realistic heterotic orbifolds models with an anomalous U(1)X , a nonzero Kobayashi-Masakawa (KM) phase is shown to arise generically from the expectation values of complex scalar fields, which appear in nonrenormalizable quark mass couplings. Modular covariant nonrenormalizable superpotential couplings are constructed. A toy Z3 orbifold model is analyzed in some detail. ...
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We classify compactification lattices for supersymmetric Z2×Z2 orbifolds. These lattices include factorisable as well as non-factorisable six-tori. Different models lead to different numbers of fixed points/tori. A lower bound on the number of fixed tori per twisted sector is given by four, whereas an upper bound consists of 16 fixed tori per twisted sector. Thus, these models have a variety of...
متن کاملDiscrete R-symmetry anomalies in heterotic orbifold models
Anomalies of discrete R-symmetries appearing in heterotic orbifold models are studied. We find that the mixed anomalies for different gauge groups satisfy the universal Green-Schwarz (GS) condition, indicating that these anomalies are canceled by the GS mechanism. An exact relation between the anomaly coefficients of the discrete Rsymmetries and one-loop beta-function coefficients is obtained. ...
متن کاملAnnihilation Radiation of Dark Matter in Heterotic Orbifold Models
Gianfranco Bertone 1, Pierre Binétruy 2,3, Yann Mambrini 4, Emmanuel Nezri 2,3 1 NASA/Fermilab Astrophysics Group, Fermi National Accelerator Laboratory, Box 500 Batavia, IL 60510-0500 2 Laboratoire de Physique Théorique des Hautes Energies, Université Paris-Sud, F-91405 Orsay 3 APC Université Paris 7, Collège de France, F-75231 Paris Cedex 05 and 4 Departamento de F́ısica Teórica C-XI and Insti...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2001
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(01)01180-7